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A wireless chemical sensor featuring iron oxide nanoparticl-embedded hydrogels

Authors
Song, SH (Song, S. H.)Park, JH (Park, J. H.)Chitnis, G (Chitnis, G.)Siegel, RA (Siegel, R. A.)Ziaie, B (Ziaie, B.)
Issue Date
Mar-2014
Publisher
ELSEVIER SCIENCE SA
Keywords
Chemical sensor; Hydrogel; Superparamagnetic nanoparticles; pH sensor; Ferrogel; Wireless sensor
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.193, pp 925 - 930
Pages
6
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
193
Start Page
925
End Page
930
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147345
DOI
10.1016/j.snb.2013.12.012
ISSN
0925-4005
Abstract
In this paper, we introduce a wireless chemical sensor based on a magnetically functionalized hydrogels (ferrogels). By embedding superparamagnetic nanoparticles into the hydrogel network and laminating the hydrogel on a planar coil, the swelling state of the hydrogel, which depends on the chemical environment, can be interrogated by measuring its magnetic permeability. To validate the chemical sensing principle, a pH sensor is fabricated using a poly(methacrylic acid-co-acrylamide) pH sensitive hydrogel, and repeatable, reversible responses are obtained to pH changes, which are easily discriminated down to 0.1 pH unit. It is anticipated that the same scheme can be applied to hydrogels sensitive to different stimuli (e. g., glucose, specific ions, antigens, temperature, etc.), and that this sensor can be configured for implantation and wireless monitoring. (C) 2013 Elsevier B.V. All rights reserved.
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첨단소재·전자융합공학부 (지능형전자시스템전공)
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